Year	Number
2004-01-01	2
2005-01-01	12
2006-01-01	12
2007-01-01	16
2008-01-01	22
2009-01-01	47
2010-01-01	84
2011-01-01	167
2012-01-01	292
2013-01-01	334
2014-01-01	369
2015-01-01	380
2016-01-01	400
2017-01-01	406